Radley Balko of The Agitator is having fun by posting a news brief about "250 small earthquakes that have occurred in Yellowstone National Park since Friday," along with a link about the supervolcano sleeping under Yellowstone:
This last happened at the Yellowstone volcano approximately 650,000 years ago. The caldera that it left is 53 miles long and 28 miles wide. In the area surrounding Yellowstone, 3000 square miles were subjected to a flow of pyroclastic material composed of 240 cubic miles of hot ash and pumice. Ash was also thrown into the atmosphere and blanketed much of North America. It can still be identified in core samples from as far away as the Gulf of Mexico.
Another catastrophic eruption is also possible. The effects of such a disaster are hard to even comprehend. Bill McGuire, professor of geohazards at the Benfield Greig Hazard Research Centre at the University College of London told the UK Daily Express, "Magma would be flung 50 kilometers into the atmosphere. Within a thousand kilometers virtually all life would be killed by falling ash, lava flows and the sheer explosive force of the eruption. One thousand cubic kilometers of lava would pour out of the volcano, enough to coat the whole USA with a layer 5 inches thick." He adds that it would once again bring "the bitter cold of Volcanic Winter to Planet Earth. Mankind may become extinct."